Haven't had any codes for my truck yet, but a friend had a check engine light and was able to determine his exact issue with this. Great for the price.

First what I don’t like:This is really about the main application setup that is initially recommended with the unit – “Torque” not the unit (ATOTO AC-4450).I could see Torque is preinstalled on the ATOTO A6PF Android Double-DIN Car Stereo, but the instructions talk about installing it on your phone first, so I thought this was part of the setup/install piece – note you don’t need to as I realized after a few attempts.Then after trying to follow the instructions, you realize that it’s for an android phone only (I have a apple phone). The Apple store has so many different app’s named "Torque" from different software vendors 🙄.To be honest I didn’t try any other apps I just wanted to be able to have a dashboard with dials of several the major sensor outputs, other than the standard Speed, Rev’s etc. and when needed to run a diagnostic on any issues/errors.Next is minor, remember you must connect it twice – first with the head unit with Bluetooth.Then second with the app. It took me a while to click 😉. I believe this is because Torque the app can link in different ways on multiple difference devices.What I do like:It’s smaller than any other of my OBDII Diagnostic Scanners I have used.Slots in with no issues.After setup performs perfectly.The price is very reasonable.I would recommend this as a nice module add-on to the head Unit (ATOTO A6PF Double-DIN)I’ve only had the head Unit & ATOTO AC-4450 installed for 2 weeks, time will tell, if something drastically changes, I will update the review.

I really liked that it came so fast. I does exactly as advertised. I will definitely be buying more from your company.

pair it, and info comes flowing. as little or as much as you want. sent to my head unit or my phone ( so i can put it in any vehicle!!!! how did we live w/o this???

Is a very nice tool that allows you to connect to your smart radio ( my personal use the Atoto S8 ) or your smart phone , very small and just plug in your OBD connector and paired via Bluetooth ,there is deafferents APP that are supported but I did use the Torque Pro App ($5 on play store) that let you also clear codes , my truck do not have transmission temperature gauge but with this set up I can monitoring all the time especially when towing, I all ready use to diagnose and clear codes on my wife and my car , for $25 dollars you can know ahead if your CEL is critical or just simple issue.